<template> 
  <div class="mod-demo-echarts">   
   
    <el-row :gutter="20">
      
      <el-col :span="24">
        <el-card>
          <div id="J_chartBarBox" class="chart-box"></div>
        </el-card>
      </el-col>      
    </el-row>
  </div>
</template>

<script>
  import echarts from 'echarts'
  export default {
    data () {
      return {       
        chartBar: null,
         beginTime: '',
         endTime: '',
         mapList: [],
         xData: [],
         yData: [],
         btnDisabled: false
      }
    },
    mounted () {     
         this.create()
    },
    activated () {
      // 由于给echart添加了resize事件, 在组件激活时需要重新resize绘画一次, 否则出现空白bug     
      if (this.chartBar) {
        this.chartBar.resize()
      }     
    },
    methods: {      
      create () {
         this. getDataList ()
         this.initChartBar()  
      },
       // 获取数据列表
      getDataList () {
        this.dataListLoading = true
        this.$http({
          url: this.$http.adornUrl('/question/question/countTypeQuestion'),
          method: 'get'          
        }).then(({data}) => {
          if (data && data.code === 0) {            
            this.mapList = data.data   
            this.xData = []
            this.yData = []         
            for(let j in this.mapList){
            this.xData.push(this.mapList[j].name)
            this.yData.push(this.mapList[j].num)
            }
             console.log(this.xData)
            console.log(this.yData)
            this.chartBar.resize()
          // this.xData= this.mapList.map(obj => n.NAME);       
          // this.yData= this.mapList.map(obj => n.VALUE);  
          this.chartBar.setOption({
             xAxis: [
            {
              type: 'category',
              data: this.xData
            }
          ],
          yAxis: [
            {
              type: 'value'
            }
          ],
          series: [
            {
              name: '题目数量',
              type: 'bar',
              data: this.yData
            }
          ]
          })
          } else {
            this.mapList = []           
          }        
        })
      },
      // 柱状图
      initChartBar () {

        var option = {
          tooltip: {
            trigger: 'axis',
            axisPointer: {
              type: 'shadow'
            }
          },
          legend: {
            data: ['题目数量']
          },
          grid: {
            left: '3%',
            right: '4%',
            bottom: '3%',
            containLabel: true
          },
          xAxis: [
            {
              type: 'category',
              data: this.xData
            }
          ],
          yAxis: [
            {
              type: 'value'
            }
          ],
          series: [
            {
              name: '每日注册用户数',
              type: 'bar',
              data: this.yData
            }
          ]
        }
        this.chartBar = echarts.init(document.getElementById('J_chartBarBox'))
       // this.chartBar.setOption(option)
        window.addEventListener('resize', () => {
          this.chartBar.resize()
        })
      }     
    }
  }
</script>

<style lang="scss">
  .mod-demo-echarts {
    > .el-alert {
      margin-bottom: 10px;
    }
    > .el-row {
      margin-top: -10px;
      margin-bottom: -10px;
      .el-col {
        padding-top: 10px;
        padding-bottom: 10px;
      }
    }
    .chart-box {
      min-height: 400px;
    }
  }
</style>